[Mono-bugs] [Bug 432892] New: Overloaded Send()-Methods in System.Net. NetworkInformation.Ping return diffrent results

bugzilla_noreply at novell.com bugzilla_noreply at novell.com
Tue Oct 7 02:32:02 EDT 2008


           Summary: Overloaded Send()-Methods in
                    System.Net.NetworkInformation.Ping return diffrent
           Product: Mono: Class Libraries
           Version: 2.0
          Platform: i686
        OS/Version: openSUSE 11.0
            Status: NEW
          Severity: Normal
          Priority: P5 - None
         Component: System
        AssignedTo: mono-bugs at lists.ximian.com
        ReportedBy: j.hofmann at ontiv.com
         QAContact: mono-bugs at lists.ximian.com
          Found By: ---

If just tried new VMware-Image (OpenSuse 11.0, Mono 2.0) and run a small
application that i developed with .NET (Windows XP, Visual Studio 2008). This
application uses the System.Net.NetworkInformation.Ping class to ping an
computer (default gateway) in the local network. Using the Ping-class under
Mono throws an exception (see below), so I tried the overloaded Send()-Methods
of the Ping-class to get around the exception, but i get diffrent results. 

Using Send(byte[]) returns a PingReply with IPStatus.Success, while the
Send(string) throws an exception.

The VM has internet connection and i can ping the host system (using shell).
Host system can ping the VM, too.

I´ve read somewhere that Ping under Linux, works diffrently than on Windows,
so i don´t know if its a bug.

Here´s the code:

using System;
using System.Net.NetworkInformation;
using System.Net;

namespace pingtest {
  class MainClass{
    public static void Main(string[] args){
      Ping p = new System.Net.NetworkInformation.Ping();
      byte[] ip = new byte[4]{192,168,73,110};  //ip of default gateway         
      //IPHostEntry entry = Dns.GetHostEntry(new IPAddress(ip));

      PingReply reply = p.Send(new IPAddress(ip));
      System.Diagnostics.Debug.Assert(reply.Status == IPStatus.Success);

      reply = p.Send("");  // ip of default gateway
      System.Diagnostics.Debug.Assert(reply.Status == IPStatus.Success);


Unhandled Exception: System.Net.Sockets.SocketException: No such host is known
  at System.Net.Dns.hostent_to_IPHostEntry (System.String h_name,
System.String[] h_aliases, System.String[] h_addrlist) [0x000aa] in
  at System.Net.Dns.GetHostByAddressFromString (System.String address, Boolean
parse) [0x00045] in
  at System.Net.Dns.GetHostEntry (System.Net.IPAddress address) [0x00011] in
  at System.Net.Dns.GetHostEntry (System.String hostNameOrAddress) [0x00045] in
  at System.Net.NetworkInformation.Ping.Send (System.String hostNameOrAddress,
Int32 timeout, System.Byte[] buffer, System.Net.NetworkInformation.PingOptions
options) [0x00000] in
  at System.Net.NetworkInformation.Ping.Send (System.String hostNameOrAddress,
Int32 timeout, System.Byte[] buffer) [0x00000] in
  at System.Net.NetworkInformation.Ping.Send (System.String hostNameOrAddress,
Int32 timeout) [0x00000] in
  at System.Net.NetworkInformation.Ping.Send (System.String hostNameOrAddress)
[0x00000] in
  at (wrapper remoting-invoke-with-check)
System.Net.NetworkInformation.Ping:Send (string)
  at pingtest.MainClass.Main (System.String[] args) [0x00046] in

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